<script lang="ts" setup name="HomeBrand">
import useStore from '@/store'
import HomePanel from './home-panel.vue'
import { useLazyData } from '@/utils/hooks'
import { ref } from 'vue'
const { home } = useStore()
const target = useLazyData(home.getBrandList)
const active = ref(0)
// 左箭头的处理函数
const prev = () => {
  // 左箭头的临界值 0
  if (active.value === 0) return
  active.value--
}
// 右箭头的处理函数
const next = () => {
  // 数据是22条 一页展示5张
  if (active.value === Math.ceil(home.brandList.length / 5 - 1)) return
  active.value++
}
</script>

<template>
  <HomePanel ref="target" title="热门品牌" sub-title="国际经典 品质保证">
    <template #right>
      <a
        href="javascript:;"
        class="iconfont icon-angle-left prev"
        @click="prev"
        :class="{ disabled: active === 0 }"
      ></a>
      <a
        href="javascript:;"
        class="iconfont icon-angle-right next"
        @click="next"
        :class="{
          disabled: active === Math.ceil(home.brandList.length / 5 - 1),
        }"
      ></a>
    </template>
    <div class="box" ref="box">
      <ul
        class="list"
        :style="{
          transform: `translateX(${active * -1240}px)`,
          width: `${Math.ceil(home.brandList.length / 5) * 100 + '%'}`,
        }"
      >
        <li v-for="item in home.brandList" :key="item.id">
          <RouterLink to="/">
            <img v-lazy="item.picture" alt="" />
          </RouterLink>
        </li>
      </ul>
    </div>
  </HomePanel>
</template>

<style scoped lang="less">
.home-panel {
  background: #f5f5f5;
}
.iconfont {
  width: 20px;
  height: 20px;
  background: #ccc;
  color: #fff;
  display: inline-block;
  text-align: center;
  margin-left: 5px;
  background: @xtxColor;
  &::before {
    font-size: 12px;
    position: relative;
    top: -2px;
  }
  &.disabled {
    background: #ccc;
    cursor: not-allowed;
  }
}
.box {
  display: flex;
  width: 100%;
  height: 345px;
  overflow: hidden;
  padding-bottom: 40px;
  .list {
    width: 200%;
    display: flex;
    transition: all 1s;
    li {
      margin-right: 10px;
      width: 240px;
      &:nth-child(5n) {
        margin-right: 0;
      }
      img {
        width: 240px;
        height: 305px;
      }
    }
  }
}
</style>
